References/Notes/Attributions:
Source
A.J. Weekes (1986) A Genstat Primer. Edward Arnold.
S. M. Stigler (1977) Do robust estimators work with real data? Annals of Statistics 5, 1055–1098.
References
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.